Telephone-exchange system.



v No. 851,792. PATENTED APR. so. 1907. Q E J. A. AVEN.

TELEPHONE EXCHANGE SYSTEM.

APPLICATION PILED'NOV. 1, 1904.

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JOHAN ANTON AVEN, OF STOCKHOLM, SWEDEN, ASSIGNOR, BY MESNE AS-SIGNMENTS, TO THE FIRM OF DEUTSCHE SCHAFT MIT BESCIIRANKTER IIAFTUNG, OFBERLIN,

TELEPHONWERKE GESELL- GERMANY.

TELEPHONE-EXCHANGE SYSTEM.

Specification of Letters Patentv Patented April 30, 1907.

Application filed November 1, 19%. Serial No. 230,944.

To (til/ whom, it 112/114, cont/141' Be it known that I, Jonas: ANTONAvizN, a subject of the King of Sweden, residing at Stockholm, in theKingdom of Sweden, have invented new and useful Improvements in Telephone-Exchange Systems, of which the following is a specification.

My invention relates to a telephone call distributing system and ismaterially distinguished from the usual systems of that kind by themanner in which the work to be done is distributed.

As is well known, hitherto two operators, the so-callec distributing andconnecting operators have both to handle each one .plug. Thedistributing operator upon receiving a call inserted a plug into theanswering jack of the calling subscribers line, said plug beingconnected with another plug at the connecting board, wherea'fter theconnecting operator answered the call of the calling subscriber andcompleted the connection wanted. According to my invention, however, aconnection between two subscribers is eil'ected in quite another manner.The operator who receives the call and Whom I will designate asannunciator operator has no plug at all. At her place only annunciators,such as drops or lamps, are provided and further means for communicatingto the connecting operator the number of the calling subscriber. Thismeans for communicating the number of the calling subscriber to theconnecting op erator may consist for instance in an order circuitextending from the head set of the annunciator operator over a key tothe head set of the connecting operator, or of figure indicators,pointers orthe like. The connecting operator upon receiving the number iof the calling subscriber inserts her answering plug into the jack ofthe calling subscribcrs line provided at her place and makes then theconnection in exactly the same way in a usual telephone exchange, 'i. e.as in a telephone exchange wherein each connection is made by only oneoperator. From the exchange of the latter system my invention differs bythe fact that the annunciators are all combined in a special board andhave a special operator attending the same. B y this arrangement anessentially greater speed of the work is obtained, as the annunciatoroperl l l ator has only to attend to the line signals but not to the cutoil signals and as she can always select a free connecting operator forestablishing the wanted connection. Furthermore, according to myinvention answering jacks are fully dispensed with, the multiple jacksat the connecting board serving as well for answering as for connect,-mg.

In the accompanying drawing the subject matter of my invention isdiagrammatically illustrated in one form.

The subscriber stations, two of which O, D are illustrated, areconnected with the multiple jacks c, 0 a and (Z (Z (Z respectively andwith the armatures o'l cut-oil relays a, b. The lines 1 and 3 extendfrom one armature of the corresponding cut-oil relay 6t, 1) directly toone pole of the central battery 2, while the other subscribers lines 2,4 extend to the other pole of the battery 2 over a line relay (1 and 0,respectively, the line relays controlling the lamps f, g. All the linesignals are combined in a special board which I will designateannunciator board, while all the jacks are combined in another specialboard, which I will call connecting boarc Of course each subscribersline has a jack in every section of the connecting board. Theannunciator operator A is provided with the usual head set i, aplurality oi" keys 3' and a plurality o'l busy signals Ir. Each oi thelatter is connected with one position at the connecting board and showswhether the operator at the latter position is busy or not. The cordsystem of the connecting operator I may be arranged in any of the usualmanners but has in addition a relay m and two springs a a in thecombined listening and ringing key 0. y) is the head set, (1 the ringingmachine, 2 the central battery, which may be ofcourse combined with thebattery .2 to a single one, '7' an impedance coil. 8, s are theclearing-out signals and L, t the answering and connecting jackrespectively. Each position at the con necting boa-rd B is furtherprovided with two relays a, o and a so-callcd position switch w.

The operation is as follows: It the subscriber C wants for instance tobe connected with the subscriber D, he takes his receiver from its hook,whereupon the line relay (1 attracts its armature so that the circuit ofstrument in an annunciator board and a terthe line lamp f is closed. Onseeing the line necting board for answering the call, testing lamp flighted up, the annunciator operator the line of the wanted subscriber,ringing the the lamp kof which is latter up, and connecting the callingsub- A presses such a key y not lighted up and thus indicates thecorrescriber with the wanted subscriber, and

means for communicating from the annunsponding connectingoperatorBasflee. The

ciator board to the connecting board the lamp 7c forms a part of acircuit containing the number of the calling subscriber; whereby aarmature of the relay 1; of the corresponding I connecting operator B.As long as the latconnecting operator is notified by an annunciatoroperator to make a connection, subter is not busy, her relay m has nocurrent so that the following circuit is closed: the free stantially asdescribed.

2. In a call distributingsystem comprising pole of battery 2, 5, onearmature of m, 6,

telephone lines, each having a signaling inarmature of u, i), w, ground.Therefore the armature of the relay 1) is attracted as long strument 111an annunc ator board and a ternnnal socket in each of several sectionsin a the operator B is free. By pressing the key multiple connectingboard, means at the cony' the operator A connects first her head nectingboard for answering the call, testing set '5 over the wires 7, 8 and twoarmatures of the relay m with the head set p of the opthe line of thewanted subscriber, ringing the latter up, and connecting the callingsuberator B, and secondly closes the circuit of the relay a over thesprings y' y' of her key y'. scriber with the wanted subscriber, orderwires extending from each annunciator op The relay it attracts itsarmature and breaks the circuit of the relay 2) so that the armatureerator to a plurality of connecting oiperators, and signaling circuitsextending om the of the latter falls back and closes the circuitconnecting operators to the annunciator opof the lamp 7s, which is ofcourse bridged to similar lamps at the other positions at the erators;whereby a connecting operator is annunciator board. Hereby the operatorB notified by an annunciator operator to make is indicated as busy notonly at the position of a connection, and the annunciator operators theoperator A but also on the other positions are apprised of the readinessof a connecting at the annunciator board. The operator A operator tomake connections, substantially now tells the number of the callingsubscriber as described.

0 to the operator B whereupon the latter 3. Inacall distributing systemcomprising telephone lines, each having a signaling ininserts theanswering plug 25 into the jack 0 at her position, which is connectedwith the strument in an annunciator board and a terminal socket in eachof several sections in a calling station, inquires the number of thesubscriber wanted D, makes the busy test of multiple connecting board,means at the connecting board for answering the call, testing the lineof the subscriber D and rings him up. By the insertion of the answeringplug it into the line of the wanted subscriber, ringing the latter up,and connecting the calling subthe jack 0 the circuit of the cut-offrelay a is closed in the usual way over the sleeve strand, scriber withthe wanted subscriber, order wires extending from each annunciatoroperator so that the line lamp f extinguishes. By throwing the key 0into the listening posito aplurality of connecting operators, signalingcircuits extending from the connecting tion (to the left) the springs71}, 12, make contact and thus close the circuit of the relay in,operators to the annunciator operators, said which receives current onthe following way: free pole of 2, 5, m, n n ground. The relay mtherefore attracts its three armatures and breaks thus first theconnection between the two head sets i, p of the operators A and B, andsecondly the connection between the wires 5 and 6. The latterarrangement has for its purpose to prevent the relay '2) from beingexcited even after the armature of the relay a has fallen back inconsequence of the fact that the operator A has released her key j.l/Vhen the connect ing operator B leaves her place, she pulls the i plugw out, which is associated with the I switch to, so that the latter isopened. In

this manner her position is indicated as busy,

relay at the annunciator board controlling said signals; whereby aconnecting operator is notified by an annunciator operator to make aconnection, and the annunciator operators are apprised of the readinessof a connecting operator to make connections, sub stantially asdescribed.

4. In a call distributing system comprising telephone lines, each havinga signaling in strument in an annunciator board and a ter minal socketin each of several sections in a multiple connecting board, means at theconnecting board for answering the call, testing the line of the wantedsubscriber, ringing the latter up, and connecting the calling subthoughit is not occupied. scriber with the wanted subscriber, order claim: Iwires extending from each annunciator op- 1. In a call distributingsystem comprising erator to a plurality of connecting operators,telephone lines, each having a signaling in- I signaling circuitsextending from the connecting operators to the annunciator operators,said signaling circuits containing signals at the annunciator board anda switch minal socket in each of several sections in a multipleconnecting board, means at the con- I signaling circuits containingsignals and a and a relay at the connecting board controlling saidsignals, whereby a connecting operator is notified by an annunciatoroperator to make a connection, and the annunciator operators areapprised of the readiness of a connecting operator to make connections,and whereby a position at the connecting board can be notified asengaged at the annuneiator board if said position is not attended to byan operator.

5. In a call distributing system, comprising telephone lines, eachhaving a signaling in strurnent in an annunciator board and a terminalsocket in each of several sections in a multiple connecting board, meansat the connecting board for answering the call, testing the line of thewanted subsc'riber, ringing the latter up, and connecting the callingsubscriber with the Wanted subscriber, order Wires extending from eachannunciator operator to a plurality of connecting operators, signalingcircuits extending from the conrials at the annunciator nectingoperators to the annunciator operators, said signaling circuitscontaining sigboard and being controlled by a relay, a second relaycontrolling the said relay and being itsel'l controlled by the key ofthe annunciator operator, a third relay placed at the connecting boardand con trolling also the lirst relay and the order circuit; whereby aconnecting operator is notified by an annunciator operator to make aconnection, and the annunciator operators are apprised of the readinessof a connecting operator to make connections, substantially asdescribed. 1

In testimony whereof 1 have signed my name to this specification in thepresence of two subscribing witnesses.

JOlil AN AN TON AVEN \Vitnesses:

HENRY Hasrnn, WoLnniuAn llAUPT.

